Crossword Genius

Excessive start to opera: composer’s last in different form? (8)

Ross

I believe the answer is:

overdone

'excessive' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for overdone that I've seen before include "Exaggerated; burnt (meat)" , "Hammed up" , "Cooked too long" , "Cooked too much or carried too far" , "really a bit much!" .)

I've seen this clue in The Times.
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